#include <bits/stdc++.h>
using namespace std;
const int N = 1e6;
int a[N];
int main() {
	int n, p, x, y, z;
	cin >> n >> p;
	for (int i = 1; i <= n; i++)
		cin >> a[i];
	for (int i = 1; i <= p; i++) {
		cin >> x >> y >> z;
		for (int i = x; i <= y; i++)
			a[i] += z;
	}
	sort(a + 1, a + n + 1, less<int>());
	cout << a[1];
    return 0;
}

求助大佬！